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EC_POINT_invert.3
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Similarly EC_POINT_dbl doubles the point \fBa\fR and places the result in \fBr\fR. In both cases it is valid for \fBr\fR to be one of \fBa\fR or \fBb\fR. .PP EC_POINT_invert calculates the inverse of the supplied point \fBa\fR. The result is placed back in \fBa\fR. .PP The function EC_POINT_is_at_infinity tests whether the supplied point is at infinity or not. .PP EC_POINT_is_on_curve tests whether the supplied point is on the curve or not. .PP EC_POINT_cmp compares the two supplied points and tests whether or not they are equal. .PP The functions EC_POINT_make_affine and EC_POINTs_make_affine force the internal representation of the \s-1EC_POINT\s0(s) into the affine co-ordinate system. In the case of EC_POINTs_make_affine the value \fBnum\fR provides the number of points in the array \fBpoints\fR to be forced. .PP EC_POINT_mul calculates the value generator * \fBn\fR + \fBq\fR * \fBm\fR and stores the result in \fBr\fR. The value \fBn\fR may be \s-1NULL\s0 in which case the result is just \fBq\fR * \fBm\fR. .PP EC_POINTs_mul calculates the value generator * \fBn\fR + \fBq[0]\fR * \fBm[0]\fR + ... + \fBq[num\-1]\fR * \fBm[num\-1]\fR. As for EC_POINT_mul the value \&\fBn\fR may be \s-1NULL\s0. .PP The function EC_GROUP_precompute_mult stores multiples of the generator for faster point multiplication, whilst EC_GROUP_have_precompute_mult tests whether precomputation has already been done. See \fIEC_GROUP_copy\fR\|(3) for information about the generator. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The following functions return 1 on success or 0 on error: EC_POINT_add, EC_POINT_dbl, EC_POINT_invert, EC_POINT_make_affine, EC_POINTs_make_affine, EC_POINTs_make_affine, EC_POINT_mul, EC_POINTs_mul and EC_GROUP_precompute_mult. .PP EC_POINT_is_at_infinity returns 1 if the point is at infinity, or 0 otherwise. .PP EC_POINT_is_on_curve returns 1 if the point is on the curve, 0 if not, or \-1 on error. .PP EC_POINT_cmp returns 1 if the points are not equal, 0 if they are, or \-1 on error. .PP EC_GROUP_have_precompute_mult return 1 if a precomputation has been done, or 0 if not. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIcrypto\fR\|(3), \fIec\fR\|(3), \fIEC_GROUP_new\fR\|(3), \fIEC_GROUP_copy\fR\|(3), \&\fIEC_POINT_new\fR\|(3), \fIEC_KEY_new\fR\|(3), \&\fIEC_GFp_simple_method\fR\|(3), \fId2i_ECPKParameters\fR\|(3)